He's gotten less rebellious with age (though he still has a problem with authority) but Eddard definitely would have been a trouble maker in class. He'd be that kid that smokes cigarettes in the bathroom. He'd probably get in the occasional fight though it'd be to protect someone else from some bully or the like instead of one that he instigated himself. He wouldn't be the most popular kid but he wouldn't care either. He'd just try and pass (if just barely) while making things exciting every now and then.
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Basically:[youtube]5oVBvxA0mm0[/youtube]
"When the power of love overcomes the love of power, the world will know peace." -Jimi Hendrix